Reasonable adjustment of the morphology and surface modification with precious metals are effective methods to improve gas sensitive properties. In this work, the gold-loaded mesoporous In₂O₃ nanoparticles were successfully synthesized through facile hydrothermal reaction and surface in situ reduction reaction in the absence of templates and surfactants. Microstructure and morphological characteristics of obtained gold-loaded mesoporous In₂O₃ nanoparticles were characterized by XRD, XPS, SEM and TEM. The characterization results revealed that the particle size of obtained gold-loaded In₂O₃ samples are between 50 and 150 nm, and the specific surface area is 31.9 m²/g. Many mesopores formed on the surface, and the pore size is concentrated in 14 nm. Through systematic gas sensing tests, we found that due to the electron sensitization and chemical sensitization of gold nanoparticles, the activation energy of the reaction is effectively reduced, the diffusion of adsorbed oxygen is accelerated and the content of vacancy oxygen and chemisorbed oxygen is significantly increased. The results presented that sensors based on gold-loaded mesoporous In₂O₃ showed ultra-high sensitivity to 100 ppm ethanol at the temperature of 220 °C, which is far superior to pure In₂O₃ materials. Operating temperature, response and recovery time, selectivity and stability are also relatively better. It is expected for gold-loaded In₂O₃ to become an ideal material for ethanol detection in the field of gas sensors.

合理调整形貌和用贵金属进行表面改性是提高气敏性能的有效方法。在这项工作中，在没有模板和表面活性剂的情况下，通过简单的水热反应和表面原位还原反应成功地合成了载金介孔 In ₂ O ₃纳米粒子。通过XRD、XPS、SEM和TEM对所得载金介孔In ₂ O ₃纳米粒子的微观结构和形态特征进行了表征。表征结果表明，所得载金In ₂ O ₃样品的粒径在50～150 nm之间，比表面积为31.9 m ²/G。表面形成许多介孔，孔径集中在14 nm。通过系统的气敏测试，我们发现由于金纳米粒子的电子敏化和化学敏化，有效降低了反应的活化能，加速了吸附氧的扩散，显着增加了空位氧和化学吸附氧的含量。 . 结果表明，基于载金介孔 In ₂ O ₃的传感器在 220 °C 的温度下对 100 ppm 乙醇表现出超高灵敏度，远远优于纯 In ₂ O ₃材料。工作温度、响应和恢复时间、选择性和稳定性也相对较好。载金In ₂ O ₃有望成为气体传感器领域乙醇检测的理想材料。